Android Programming Tutorials

What's Your Preference?

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

helper=new RestaurantHelper(this);

prefs=PreferenceManager.getDefaultSharedPreferences(this);

name=(EditText)findViewById(R.id.name);

address=(EditText)findViewById(R.id.addr);

notes=(EditText)findViewById(R.id.notes);

types=(RadioGroup)findViewById(R.id.types);

initList();

prefs.registerOnSharedPreferenceChangeListener(prefListener);

}

Also, we can call initList() from prefListener:

private SharedPreferences.OnSharedPreferenceChangeListener prefListener=

new SharedPreferences.OnSharedPreferenceChangeListener() {

public void onSharedPreferenceChanged(SharedPreferences sharedPrefs,

String key) {

if (key.equals("sort_order")) {

initList();

}

}

};

At this point, if you recompile and reinstall the application, you should see

the sort order change immediately as you change the order via the

preferences.

Extra Credit................................................................................................

Here are some things you can try beyond those step-by-step instructions:

• Add a preference for the default type of restaurant (e.g., take-out).
  Use that preference in detail forms when creating a new restaurant.


• Add an option menu to the detail form activity and have it be able
  to start the preference activity the way we did from the option
  menu for the list.


• Rather than use preferences, store the preference values in a JSON
  file that you read in at startup and re-read in onResume() (to find out

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